GAI-Tronics ITA2000A User Manual
Pub. 43004-010H
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
ITA2000A Series Tone Remote Adapter
with Scanning
User and Installation Manual
*U.S. Patent 6,950,653
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
V
CONFIDENTIALITY NOTICE
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
COMPUTER SOFTWARE COPYRIGHTS
This product contains copyrighted computer programs stored in semiconductor memory. These programs
are copyrighted by GAI-Tronics Corporation and may not be reproduced in any form without express
written permission from GAI-Tronics.
WARRANTY
GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any GAI-Tronics equipment supplied hereunder
shall be free of defects in material and workmanship, shall comply with the then-current product specifications and product
literature, and if applicable, shall be fit for the purpose specified in the agreed-upon quotation or proposal document. If (a)
Seller’s goods prove to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above, Buyer may return such
goods to GAI-Tronics’ nearest depot repair facility, freight prepaid, at which time they will be repaired or replaced, at Seller’s
option, without charge to Buyer. Repair or replacement shall be Buyer’s sole and exclusive remedy, and the warranty period on
any repaired or replacement equipment shall be one (1) year from the date the original equipment was shipped. In no event shall
GAI-Tronics’ warranty obligations with respect to equipment exceed 100% of the total cost of the equipment supplied hereunder.
The applicability of any such third-party warranty will be determined solely by GAI-Tronics.
Services. Any services GAI-Tronics provides hereunder, whether directly or through subcontractors, shall be performed in
accordance with the standard of care with which such services are normally provided in the industry. If the services fail to meet
the applicable industry standard, GAI-Tronics will, for a period of one (1) year from the date of completion, re-perform such
services at no cost to the Buyer. Re-performance of services shall be Buyer’s sole and exclusive remedy, and in no event shall
GAI-Tronics’ warranty obligations with respect to services exceed 100% of the total cost of services provided hereunder.
Limitations/Exclusions. The warranty on any equipment supplied hereunder is subject to Customer’s use in compliance
with applicable FCC regulations and manufacturer specifications. The warranties herein shall not apply to, and GAI-Tronics
shall not be responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent caused by
accident, misuse, abuse, neglect, system design, product modification, failure to follow instructions contained in the product
manual, repair, or attempted repair by anyone not authorized by GAI-Tronics, improper installation, installation of parts that do
not conform to the quality or specifications of the original parts or accessories, damage or loss occurred during shipment, or any
unit which is not new when sold or upon which the serial number has been defaced, modified or removed. The warranty does not
extend to damage incurred by natural causes including Force Majeure. The warranty does not cover microprocessors if failure is
due to static damage or application of improper voltage.
THE WARRANTIES AND REMEDIES CONTAINED
HEREIN ARE IN LIEU OF AND EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER
EXPRESS OR IMPLIED BY OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Operational and Maintenance Procedures. Buyer acknowledges that any improper use, maintenance, or
modification of the equipment provided hereunder, or use of unqualified maintenance or service technicians will severely impair
the operational effectiveness of the entire communication system. Buyer hereby agrees to indemnify, defend and hold GAITronics harmless from and against any and all third party claims arising, in any manner, out of: (a) Buyer’s neglect of the
equipment; (b) Buyer’s use of technicians not authorized by GAI-Tronics to service the equipment; or (c) Buyer’s improper use
or modification of the equipment or failure to follow the operational and maintenance procedures provided with the equipment.
Limitation of Liability/Damages. In no event (even should circumstances cause the exclusive warranties and remedies
set forth in the Warranty section to fail of their essential purpose) shall either party be liable for any indirect, incidental, special
or consequential damages (including, but not limited to, loss of use, loss of anticipated profits, or damages arising from delay)
whether such claims are alleged to have arisen out of breach of warranty, breach of contract, strict or absolute liability in tort, or
other act, error or omission, or from any other cause whatsoever, or any combination of the foregoing.
Motorola and MAXTRAC are trademarks of Motorola, Inc.
03/13 Publication 43004-010H i
Table of Contents
FOREWORD ............................................................................................................................................................... 1
SCOPE OF MANUAL .................................................................................................................................................... 1
NOMENCLATURE ........................................................................................................................................................ 1
ORDERING REPLACEMENT PARTS .............................................................................................................................. 1
SERVICE AND REPAIR ................................................................................................................................................. 1
FCC INTERFERENCE WARNING .................................................................................................................................. 1
SAFE HANDLING OF CMOS INTEGRATED CIRCUIT DEVICES ...................................................................................... 2
DESCRIPTION............................................................................................................................................................ 3
FEATURES AND BENEFITS OF THE ITA2000A TONE REMOTE ADAPTER..................................................................... 3
ADDITIONAL FEATURES AND BENEFITS OF THE ITA2000A TONE REMOTE ADAPTER IN SCAN MODE ....................... 4
PRODUCT OVERVIEW ................................................................................................................................................. 5
ITA2000A ACCESSORIES ........................................................................................................................................... 5
SPECIFICATIONS ......................................................................................................................................................... 6
OPERATION ............................................................................................................................................................... 7
FRONT PANEL LED OPERATION ................................................................................................................................. 7
PWR LED .......................................................................................................................................................................... 7
PTT LED ............................................................................................................................................................................ 7
MON/SCAN LED .............................................................................................................................................................. 7
CSQ LED ........................................................................................................................................................................... 7
ACC PTT LED ................................................................................................................................................................... 7
SUPERVISOR LED ........................................................................................................................................................... 7
SUPERVISOR BUTTON ................................................................................................................................................. 8
DESK MICROPHONE PORT .......................................................................................................................................... 8
Desk Microphone Port Pinout .............................................................................................................................. 8
TONE CONTROL INTERFACE ....................................................................................................................................... 9
Scan Start/Stop in the Scan Mode ....................................................................................................................... 10
Radio Monitor in Scan Mode .............................................................................................................................. 10
SUPERVISOR MODE .................................................................................................................................................. 11
ACCESSORY OPERATION .......................................................................................................................................... 11
TEST MODE .............................................................................................................................................................. 12
INSTALLATION ....................................................................................................................................................... 13
PLANNING THE INSTALLATION .................................................................................................................................. 13
MOUNTING ............................................................................................................................................................... 13
EQUIPMENT REQUIRED ............................................................................................................................................. 14
Test Equipment ................................................................................................................................................... 14
Documentation .................................................................................................................................................... 14
CABLE INSTALLATION SAFETY CONSIDERATIONS..................................................................................................... 14
TELEPHONE LINE LIGHTNING AND OVER-VOLTAGE PROTECTION............................................................................. 14
POWER CONNECTIONS.............................................................................................................................................. 15
CONVENTIONAL TO SCANNING OPERATION CONVERSION ........................................................................................ 16
RADIO CONNECTOR (J2)........................................................................................................................................... 17
Input/Output Radio Connector Table ................................................................................................................. 17
ACCESSORY CONNECTOR (J3) .................................................................................................................................. 20
Input/Output Accessory Connector Table ........................................................................................................... 20
ITA2000A to Kenwood TK-790/890 Series Radio Connection Chart ................................................................. 21
ITA2000A to RPG Radio Connection Chart ....................................................................................................... 23
ITA2000A Tone Remote Adapter to MCS2000 Radio Connection Chart (Conventional Mode Only) ............... 24
03/13 Publication 43004-010H ii
Table of Contents ITA2000A Series Tone Remote Adapter
RADIO TIE LINE (TELEPHONE) CONNECTIONS .......................................................................................................... 25
Analog Facility Interface Codes ......................................................................................................................... 25
Telephone Line Connection Table ...................................................................................................................... 25
JUMPERS .................................................................................................................................................................. 26
Jumper Table ...................................................................................................................................................... 26
CHANNEL REVERT (CONVENTIONAL MODE ONLY) .................................................................................................. 27
Channel Revert Settings Table ............................................................................................................................ 27
CONFIGURATION SWITCH SETTINGS FOR CONVENTIONAL MODE OPERATION .......................................................... 28
Switch Settings for SW1 (Conventional) ............................................................................................................. 28
Switch Settings for SW2 (Conventional) ............................................................................................................. 29
CONFIGURATION SWITCH SETTINGS FOR SCAN MODE OPERATION ........................................................................... 30
Switch Settings for SW1 (Scan) ........................................................................................................................... 30
Switch Settings for SW2 (Scan) ........................................................................................................................... 31
LEVEL SETTINGS AND ADJUSTMENTS ....................................................................................................................... 32
Receive Audio Level ............................................................................................................................................ 32
Line Output Level ................................................................................................................................................ 32
Transmit Audio Level .......................................................................................................................................... 33
TEST DIAGNOSTICS .................................................................................................................................................. 34
THEORY OF OPERATION .................................................................................................................................... 35
TECHNICAL OVERVIEW ............................................................................................................................................ 35
Transmit Audio ................................................................................................................................................... 35
Radio Audio ........................................................................................................................................................ 35
Accessory Transmit ............................................................................................................................................. 36
Desk Mic Transmit .............................................................................................................................................. 36
Reset Circuit ....................................................................................................................................................... 36
TROUBLESHOOTING ............................................................................................................................................ 37
TROUBLESHOOTING THE ITA2000A TONE REMOTE ADAPTER ................................................................................ 37
FUSE REPLACEMENT ................................................................................................................................................ 38
MAIN CIRCUIT BOARD ........................................................................................................................................ 39
SCHEMATICS .......................................................................................................................................................... 41
DEFINITIONS AND ACRONYMS ......................................................................................................................... 49
03/13 Publication 43004-010H iii
Foreword
Scope of Manual
This manual offers descriptive data and service information for the ITA2000A Tone Remote Adapter
with Scanning. The unit is shipped as a conventional tone remote adapter but can easily be converted to
a scanning tone remote adapter with a simple switch setting change. Please refer to the switch settings
located in the Installation section of this manual.
Nomenclature
The model number, located on the nameplate on the bottom, specifically identifies GAI-Tronics
equipment. If additional options are ordered, the option will be identified on the circuit board.
Many ITA2000A features are the same in both Conventional and Scan modes. If a feature is particular to
either mode, the mode will be identified.
Ordering Replacement Parts
When ordering replacement parts or requesting equipment information, please include the complete
identification number. This applies to all components, kits, and chassis. If the component part number is
not known, the order should include the number of the chassis or kit of which it is a part and sufficient
description of the desired component to identify it. Order parts from:
Customer Service
GAI-Tronics Corporation
400 E. Wyomissing Ave.
Mohnton, PA 19540
US: 800-492-1212
Outside US: 610-777-1374
Service and Repair
Inoperative or malfunctioning equipment should be returned to the factory for repair. Please call
1-800-492-1212 to obtain a Return Authorization number, published repair prices, and shipping
instructions. A Return Authorization can also be obtained by visiting our website at
www.gai-tronics.com.
OTE: A purchase order or credit card number is required prior to processing non-warranty repairs.
N
FCC Interference Warning
The FCC requires that manuals pertaining to Class A and Class B computing devices must contain
warnings about possible interference with local residential radio and TV reception. This warning reads
as follows:
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
1 03/13
Foreword ITA2000A Series Tone Remote Adapter
Safe Handling of CMOS Integrated Circuit Devices
Many of the integrated circuit devices used in communications equipment are of the Complementary
Metal Oxide Semiconductor (CMOS) type. Because of their high open circuit impedance, CMOS
integrated circuits are vulnerable to damage from static charges. Care must be taken handling, shipping,
and servicing them and the assemblies in which they are used.
Even though protection devices are provided in CMOS integrated circuit inputs, the protection is
effective only against overvoltage in the hundreds of volts range such as is encountered in an operating
system. In a system, circuit elements distribute static charges and load the CMOS circuits, decreasing the
chance of damage. However, CMOS circuits can be damaged by improper handling of the modules, even
in a system. To avoid damage to circuits, observe the following handling, shipping, and servicing
precautions:
1. Prior to and while servicing a circuit module, particularly after moving within the service area,
momentarily touch both hands to a bare metal, earth-grounded surface. This will discharge any static
charge that may have accumulated on the person doing the servicing.
N
OTE: Wearing a conductive wrist strap will minimize static build-up during servicing.
2. Whenever possible, avoid touching any electrically conductive parts of the circuit module with your
hands.
3. Power down the unit before installing or removing the circuit module.
4. When servicing a circuit module, avoid carpeted areas, dry environments, and certain types of
clothing (silk, nylon, etc.) because they contribute to static build-up. Similarly, disconnect the test
probe prior to removing the ground lead.
5. All electrically powered test equipment should be grounded. Apply the ground lead from the test
equipment to the circuit module before connecting the test probe.
6. If a circuit module is removed from the system, it is desirable to lay it on a conductive surface (such
as a sheet of aluminum foil) which is connected to ground through 100k of resistance.
7. When soldering, be sure the soldering iron is grounded and has a grounded tip.
8. Prior to connecting jumpers, replacing circuit components, or touching CMOS pins (if this becomes
necessary in the replacement of an integrated circuit device), be sure to discharge any static build-up
as described in procedure 1. Since voltage differences can exist across the human body, it is
recommended that only one hand be used if it is necessary to touch pins on the CMOS device and
associated board wiring.
9. When replacing a CMOS integrated circuit device, leave the device in its conductive rail container or
conductive foam until it is to be inserted into the printed circuit module.
10. All low impedance test equipment (such as pulse generators, etc.) should be connected to CMOS
device inputs after power is applied to the CMOS circuitry. Similarly, such low impedance
equipment should be disconnected before power is turned off.
11. Replacement modules shipped separately from the factory will be packaged in a conductive material.
Any modules being transported from one area to another should be wrapped in a similar material
(aluminum foil may be used). Never use non-conductive material for packaging these modules.
03/13 2
Features and Benefits of the ITA2000A Tone Remote Adapter
Feature Benefit
Description
Adjustable receive input
sensitivity and transmit output
level
Allows flexibility with different radio systems and user
environments, where radio output levels, line losses, and noise
factors vary.
Autolevel Reduces the need for site visits to adjust audio pots. Mobiles
receive consistently high receive sound level, with fewer repeat
requests.
Selectable input/output logic
control
All inputs/outputs can be individually selected to go active high or
to ground, depending on the radio, offering compatibility with many
radio systems.
Full-duplex capable with 2- or
4-wire
With 2-wire capable desk set (such as an ITR2000A), gives fullduplex operation for use with most full-duplex and trunking radio
systems.
Modular telephone line
Easy-to-install telephone line cable.
connection on back
Selectable timed or continuous
monitor
2
Flexible monitoring option.
Multiple parallel desk set support System flexibility and productivity are enhanced when several desk
sets are connected.
16-channel control1 Each of the five-channel steer outputs can be used to change
channels and other functions on certain radios.
Courtesy tones Sends a tone to the desk set when a mobile has stopped transmitting.
Selectable 2175 Hz guard tone
2
keying
High and low level guard tones and function tones are sent in
applications where tones are needed. (e.g. wireless phone line
extension).
Supervisor control Allows the dispatcher at the ITA2000A to override remote desk sets
and accessory.
Front panel mic jack Allows dispatch control with desk microphone, headset, handset,
etc.
Accessory port Allows connection of other devices, such as a local desk set or
telephone interconnect.
1
16-channel control is available only when configured for Conventional mode. When configured for
Scan mode, only 15-channel control is available.
2
Available only when configured for Conventional mode.
3 03/13
Description ITA2000A Series Tone Remote Adapter
Additional Features and Benefits of the ITA2000A Tone Remote Adapter in Scan Mode
Feature Benefit
Adds scanning capability to
conventional multi-channel
radios
Scanning of up to 15
frequencies
Allows remote scanning and
radio control from multiple
dispatch points
Flexible scanning
configuration
Talk-back scanning Allows dispatcher to transmit on last active receive channel.
Remote scan on/off Scanning can be remotely turned on or off. Properly equipped parallel
15-channel control Each of the five channel steer outputs can be used to change channels
Enhances radio functionality by using channel steering capability of
both non-scanning and scanning radios. Reduces overall system cost.
A single multi-channel radio can remotely monitor multiple frequencies,
reducing the number of radios required for dispatch applications.
Using regular leased lines, multiple dispatchers can monitor and control
scanning capability. Each dispatch point displays currently active
receive channel.
Number of channels, scan rate, scan-stop time, and scan resume can all
be easily configured using readily accessible DIP switches.
dispatch devices are updated with the status.
and other functions on certain radios.
03/13 4
ITA2000A Series Tone Remote Adapter Description
Product Overview
The ITA2000A Tone Remote Adapter uses a state-of-the-art digital signal processor (DSP) to ensure
highly accurate and fast tone encoding/decoding and audio filtering. It allows a radio to be remotely
controlled through dedicated, leased telephone lines or in-house wiring using standard EIA tone keying
sequences.
The advantages include flexible configuration, front panel controls and status indicators for set-up
convenience, automatic level control (ALC), and a dispatcher/service mic jack. It is compact, measuring
7.03 W 6.3 L 1.5 H inches, and supports full-duplex or simplex, 2- or 4-wire desk set stations. The
ITA2000A has an accessory connector that supports local control devices, such as a telephone
interconnect, extended local desk set, or a secondary radio.
Using GAI-Tronics’ ITR2000A or IPE2500A Tone Remote Desk Set, the ITA2000A programmed for
Scan mode (using patented techniques), adds tone remote scanning and scan start/stop capability to
conventional, multi-channel, steering-capable radios. Dispatch points are updated using these techniques
through the use of the parallel status update feature found in the GAI-Tronics Model ITR2000A and
IPE2500A Desk Sets.
To accommodate radios that vary in their active input logic, the ITA2000A can be set up to provide
discrete active output logic functions. Active low or active high outputs can be set for each radio and
accessory Channel Selection Output, Monitor, Push-to-Talk, Push-to-Talk Sense, and CSQ Detect.
ITA2000A Accessories
Description Part No.
GM300/MAXTRAC or Motorola GR1225 Radio Interface Cable 61531-007
Kenwood Radio Interface Cable (KCT-19) 61531-004
Radio Interface Cable (bare leads), 3-foot (included with unit) 97C160-0003
Power Supply, 100-240 V ac/12 V dc1 40419-008
Power Supply Adapter, European 40420-001
Power Supply Adapter, UK 40420-002
Power Supply Adapter, Australia 40420-003
Power Supply Adapter, Korea 40420-004
Fuse, F2, (Telco line only) Bussmann C515S 1.25A 4612-23015-25
Fuse, F1, (Power) Bussmann Type GMA-1A 4612-23500-01
Dual 19-inch Rack Mount, 1.75-inch high (Can hold two ITA2000A
units.)
1
Power (12 V dc) may be obtained directly from the controlled radio. A local power supply, if required,
must be ordered separately.
XAC0005A
5 03/13
Description ITA2000A Series Tone Remote Adapter
Specifications
Color ...................................................................................................................................................... Black
Physical size ................................................................................................... 7.03 W 6.3 L 1.5 H inches
Weight .................................................................................................................................................... 4 lbs.
Temperature range ................................................................................................................. −30º C to 70º C
Humidity .................................................................................................................................... 95% at 50º C
Input power (main or aux.) .................................................................... 10.5 to 16 V dc; 100 mA maximum
Frequency response............................ +
Hum and noise ..................................................................................... More than -45 dB below rated output
Line audio input ........................... Microprocessor automatically compensates for line loses of up to 24 dB
Audio distortion ............................................................................................................... Less than 3% THD
RX input ............................................................. 32 mV ac to 4.5 V ac into 600 ohms (nominal 300 mV ac)
TX input ........................................................... 32 mV ac to 800 mV ac into 600 ohms (nominal 80 mV ac)
Line input ........................................................... −25 dBm to 0 dBm AGC to reference (nominal −10 dBm)
Line output ......................................... −15 dBm to +10 dBm adjustable into 600 ohms (nominal −10 dBm)
Logic outputs ........................................................................ PTT, CH-STEER; 20 mA, 100 mW dissipated
Maximum number of desk sets supported (practical limit) ........................................................................ 10
Microphone connections ..................................................................................................... Desk microphone
Input tone tolerance ................................................................................................................................. +
Safety .................................................................................................... Class III SELV powered equipment.
Powered by optional UL-listed (E104603)
and CSA certified (LR67888) ac adapter.
EMI ................................................................................................. USA: FCC Part 15, Sub. B-Verification
Canada: ICES-003
Line Interface ......................................................................... FCC Part 68 Exempt (Category II Tariff #260
service for private/leased line applications)
IC: Designed to meet CS03-8. (Cert. Pending)
Category: Voice-band metallic private line channel interface.
3 dB, 300 to 3000 Hz (except TX and RX audio notch at 2175 Hz)
2%
F1
F2
F3
F4
1
Scan operation only
2
Conventional operation only - Monitor/F16 is switch-selectable. See the programmable switch settings
1950 Hz
1850 Hz
1750 Hz
1650 Hz
F5
F6
F7
F8
1550 Hz
1450 Hz
1350 Hz
1250 Hz
F9
F10
F11
F12
1150 Hz
1050 Hz
950 Hz
850 Hz
F13
F14
F15
Scan Start/Stop1
or,
Monitor/F162
750 Hz
650 Hz
550 Hz
2050 Hz
in the “Installation” section of this manual.
03/13 6
Front Panel LED Operation
PWR LED
Operation
ITA2000
Front View of the ITA2000A
The PWR LED illuminates to indicate that the ITA2000A power is on and the DSP is operating.
PTT LED
The push-to-talk LED, labeled PTT, illuminates when a valid transmit request has been decoded or the
mic PTT is actuated.
MON/SCAN LED
Conventional: The timed or constant monitor LED, labeled MON, illuminates when the ITA2000A is in
the monitor mode.
Scan: The SCAN LED blinks at the scan rate when the ITA2000A is scanning, and is lit steadily when in
monitor mode.
CSQ LED
The CSQ LED illuminates when a carrier detect input is active.
ACC PTT LED
The ACC PTT LED illuminates when the accessory PTT input is active.
SUPERVISOR LED
The SUPERVISOR LED illuminates when the ITA2000A is placed into supervisor mode.
7 03/13
Operation ITA2000A Series Tone Remote Adapter
Supervisor Button
The SUPERVISOR button with the associated LED indicator provide full dispatcher control of the radio
system. This button is used to enter the supervisor mode or the test mode. Refer to the Operation section
for more information.
Desk Microphone Port
The front panel desk microphone port (MIC), is an 8-pin modular connector that supports an external
connection for local dispatch control. (Possible accessories include desk, gooseneck, or boom
microphones, or a headset or footswitch via the GAI-Tronics XAAB002A Audio Accessory Box).
Audio from this microphone is routed to the station transmit and receive audio and the telephone line
while push-to-talk is applied from the external microphone. The front-panel mic audio does not have a
guard tone notch applied. Station receive audio is also provided at the
allows a handset or similar device to be used in place of a desk microphone.
An external microphone monitor function places the ITA2000A in the monitor mode while asserting
PL/DPL disable at the radio connector. The microphone input type is passive, with an input impedance
of less than 2 k and a nominal input level of −20 dBm. The GAI-Tronics XDM004A Desk Microphone
is an acceptable example.
MIC connector. This feature
Desk Microphone Port Pinout
Pin No. Function
1 B+ OUT (through 10 ohms)
2 N/C
3 Monitor IN (closure to ground)
4 AGND
5 Mic IN (with bias voltage)
6 PTT IN (closure to ground)
7 N/C Desk Mic Port Pinout
8 RX audio OUT (handset audio)
03/13 8
ITA2000A Series Tone Remote Adapter Operation
The rear view of the ITA2000A shows the line, accessory, radio, and power connector locations. Also
shown are the
TX and RX level adjustment pots, and the location of the internal fuse.
RX
DC POWER
INTERNAL
FUSE
13.8VDC
0.3A
LINE
ACCESSORY
RADIO
LEVEL
TX
Rear View of the ITA2000A
Tone Control Interface
The ITA2000A decodes standard EIA tone keying control tones for controlling the radio system. The
control tone convention can be seen below.
Standard EIA Tone Control Sequence
The function tone frequency ranges from 550 Hz to 2050 Hz in 100 Hz increments. 2050 Hz represents
monitor in Conventional mode and scan start/stop in Scan mode, 1950 Hz for F1, 1850 Hz for F2 down
to 550 Hz for F15.
When scanning and carrier is detected, a similar tone sequence is generated to the phone line where
HLGT is generated for 40 ms followed by a 20 ms function tone representative of the current channel.
This tone sequence will be decoded by desk sets capable of fast parallel status update, such as the GAITronics ITR2000A and IPE2500A. The use of products that are not capable of decoding this fast tone
sequence is not advisable, as the reliability of the operator information may be less than desirable.
9 03/13
Operation ITA2000A Series Tone Remote Adapter
Scan Start/Stop in the Scan Mode
Upon power-up, the ITA2000A will automatically start scanning. While in scan mode, the ITA2000A
asserts, in sequence, the channel steer pins at the configured scan rate. Upon detection of carrier, the unit
stops scan and generates the appropriate tone sequence to the phone line. Upon loss of carrier, the unit
resumes scan after the configured scan stop time, or until manually started by that attached desk set,
depending on the configuration of the unit. When the unit resumes scan, a monitor function tone burst is
generated indicating to the attached desk sets that scan has resumed. If the operator wishes to stop the
scan resume before the scan stop time expires, the scan should be stopped using the scan stop feature.
The ITA2000A supports a remote scan start/stop toggle feature via the monitor function tone or 2050 Hz.
Pressing the desk set
MONITOR button causes a 2050 Hz tone sequence to be generated. When in scan
mode, if a valid 2050 Hz tone sequence is decoded, the unit stops scan on the current scan channel and
generates a tone burst to the phone line indicating to the attached desk set(s) the channel on which the
scan was stopped.
Likewise, when not in scan mode, if a valid 2050 Hz tone sequence is detected, the unit will resume scan.
The decoding of this 2050 Hz tone sequence by parallel desk sets indicates that scan has been resumed.
While in scan mode, if a channel steer is done by the desk set, the unit will cease scan. If the unit is
configured to resume scan after PTT, the unit will do so after the first PTT from the desk set. If the
operator wishes to remain on the channel indefinitely, scan must be stopped prior to issuing the channel
steer.
Radio Monitor in Scan Mode
The ITA2000A does not use a monitor function tone for assertion of monitor that may be required in
some installations, when in scan mode. To place the ITA2000A into monitor mode, the desk set must
force a channel steer to the desired channel by generating the appropriate function tone burst. This
causes the ITA2000A to stop scan and assert the PL/DPL disable output to the radio placing the radio in
monitor mode. When in this mode, the SCAN LED is lit. Subsequent transmissions by the desk set will
cause this assertion to be cleared until the desk set, again, generates an appropriate function tone burst.
An example of this operation using an IPE2500A Tone Remote Desk Set is as follows:
1. While scanning, the desk set operator wishes to transmit on channel 3. Before doing so, the operator
must ensure that the channel is clear by placing the radio in monitor mode on channel 3. The
operator presses the “3” key on the IPE25000A causing the desk set to generate a tone burst
consisting of HLGT followed by a function tone of 1750 Hz. Note that no low-level guard tone is
generated. The ITA2000A stops scan, switches to channel 3, asserts the PL/DPL output placing the
radio in monitor mode, and lights the SCAN LED.
2. The operator monitors the channel for activity and, upon assuring there is none, presses the
TRANSMIT key on the IPE2500A. The desk set generates a tone burst of HLGT followed by a
function tone of 1750 Hz, which is followed by LLGT. The ITA2000A asserts the radio PTT, clears
the assertion of the PL/DPL output and extinguishes the SCAN LED.
3. The operator releases the
radio. The ITA2000A does not
TRANSMIT key on the IPE2500A and the ITA2000A releases PTT from the
reassert the PL/DPL output to the radio. The operator carries on a
conversation with the field unit normally. If the unit is configured to resume scan after PTT, the unit
will do so after the scan-stop time has passed upon releasing PTT unless scan was halted prior to the
transmission.
4. If the operator wishes to again place the radio in monitor mode on channel 3, he must press the “3”
key again. The ITA2000A will decode the tone burst and place the radio into monitor mode as in
number 1 above.
03/13 10
ITA2000A Series Tone Remote Adapter Operation
Supervisor Mode
The ITA2000A is placed in the supervisor mode by pressing the SUPERVISOR button for less than four
seconds, or by pressing either the MONITOR or PTT buttons of an attached desk-mic accessory. This
feature can be disabled in Conventional mode. When supervisor mode is entered, the SUPERVISOR
LED illuminates and the ITA2000A enters home-mode state. This is useful when a dispatcher needs to
disable control of the radio from all desk set operators and the accessory input. Pressing the
SUPERVISOR button again for less than four seconds is the only method used to exit supervisor mode
and return the ITA2000A to normal operation.
In the home-mode state, the ITA2000A clears all channel steer lines to the radio and generates
continuous guard tone to the phone line. In addition, the ITA2000A ceases scanning if in Scan mode.
The generation of guard tone serves two purposes. First, all LOTL-equipped desk sets such as the
ITR2000A or IPE2500A connected to the ITA2000A will recognize the base station is now in use and
will effectively lock out any operations. Second, when using the Scan mode, the generation of the guard
tone will clear the scan (monitor) indicator of these connected desk sets indicating that scan has stopped.
When home-mode is exited, the ITA2000A returns to the previously selected channel, or if in Scan mode,
returns to the previous scan state. If scan were active prior to entering the home-mode state, the
ITA2000A returns to scan upon exiting home-mode state and generates a tone burst to the phone line to
update the connected desk sets appropriately. If scan were not active prior to entering home-mode state,
the ITA2000A will not resume scan upon exiting home-mode state.
Accessory Operation
The ITA2000A includes an accessory connector to allow access to the radio from other devices such as
an ILD1000A Local Control Desk Set, a PL1877A Telephone Interconnect, or an additional ITA2000.
With such devices, control of the radio is limited to monitor and PTT. When an accessory device
requires access to the radio, it will assert the appropriate input on the accessory connector. When this
assertion is detected, the ITA2000A enters home-mode state. This feature can be disabled when in
Conventional mode.
When an accessory asserts the accessory monitor input, the ITA2000A enters home-mode state. When
the accessory releases the accessory monitor input, the ITA2000A exits home-mode state. If in Scan
mode, the ITA2000A resumes scan after the scan stop time if scan were active prior to the assertion of
the accessory monitor input.
When the accessory asserts the accessory PTT input, the ITA2000A enters home-mode state for the
duration of the assertion when in Scan mode. When the accessory releases the accessory PTT input,
Conventional mode exits home-mode state, and Scan mode immediately returns to the previous scan
state.
11 03/13
Operation ITA2000A Series Tone Remote Adapter
Test Mode
To enter the test mode, press the SUPERVISOR button for more than four seconds. All LEDs illuminate
for two seconds indicating the ITA2000A has entered the test mode.
While the ITA2000A is in test mode, pressing the
SUPERVISOR button momentarily (less than four
seconds) causes the ITA2000A to step up to the next test.
WARNING
Disconnect the ITA2000A from the radio and disconnect all accessories from the ITA2000A when
performing Diagnostic Tests 2, 3, and 4. These diagnostics are used for factory testing only and
perform input/output configuration tests that may damage the interface to the radio and/or any
accessories connected to the ITA2000A.
Pressing the button again for at least four seconds
takes the ITA2000A out of the test mode.
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Planning the Installation
Installation
Typical ITA2000A Installation
Mounting
The ITA2000A Tone Remote Adapter can be installed in a customer-supplied rack or cabinet, or can be
placed on a desk for convenience when used with microphones and other accessories. A 19-inch
standard rack panel, 1.75 inches high, is also available. The GAI-Tronics part number is XAC0005A.
13 03/13
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